Cannula insertion devices, systems, and methods including a compressible member
First Claim
1. A cannula assembly, comprising:
- a cannula having an inner wall defining a lumen; and
an insertion device including;
(a) a shaft including a distal end, the shaft configured to be received within the lumen of the cannula;
(b) a tip member coupled to the distal end of the shaft, the tip member configured to extend distally out from the lumen of the cannula so as to be in position for dilating a puncture in a tissue;
(c) a compressible member operatively coupled to the shaft and configured to expand in a generally radially outward direction when compressed in an axial direction;
wherein the compressible member is movable from an initial state in which the compressible member has a first radial dimension to a compressed state in which the compressible member has a second radial dimension that is larger than the first radial dimension, the second radial dimension configured to engage the inner wall of the lumen of the cannula to releasably secure the insertion device to the cannula.
1 Assignment
0 Petitions
Accused Products
Abstract
An insertion device for inserting a cannula through tissue generally comprises an inner shaft, a tip member coupled to a distal end portion of the inner shaft, a hollow outer shaft slidably received over the inner shaft, and a compressible member received over the inner shaft between the tip member and the outer shaft. The compressible member is configured to be received in a lumen of the cannula, and the inner shaft is movable relative to the outer shaft along an axial direction to compress the compressible member between the tip member and the outer shaft so that the compressible member expands in a generally radially outward direction. The radial expansion of the compressible member releasably secures the insertion device to the cannula.
124 Citations
11 Claims
-
1. A cannula assembly, comprising:
-
a cannula having an inner wall defining a lumen; and an insertion device including; (a) a shaft including a distal end, the shaft configured to be received within the lumen of the cannula; (b) a tip member coupled to the distal end of the shaft, the tip member configured to extend distally out from the lumen of the cannula so as to be in position for dilating a puncture in a tissue; (c) a compressible member operatively coupled to the shaft and configured to expand in a generally radially outward direction when compressed in an axial direction; wherein the compressible member is movable from an initial state in which the compressible member has a first radial dimension to a compressed state in which the compressible member has a second radial dimension that is larger than the first radial dimension, the second radial dimension configured to engage the inner wall of the lumen of the cannula to releasably secure the insertion device to the cannula.
-
-
2. A method of inserting a cannula through tissue, the cannula including a lumen and a distal end portion, the method comprising:
-
inserting an insertion device including a distal connecting portion into the lumen of the cannula wherein the distal connecting portion comprises an inner shaft having a distal end, a tip member coupled to the distal end of the inner shaft, and a compressible member operably coupled to the inner shaft; compressing the compressible member of the insertion device in an axial direction to expand the compressible member in a generally radially outward direction so as to connect the distal connecting portion of the insertion device to the distal end portion of the cannula; and inserting the distal end portion of the cannula through the tissue while the distal connecting portion is connected to the distal end portion by exerting a pushing force on the insertion device. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A system for increasing blood flow between a chamber in a heart of a patient and a first location in the circulatory system of the patient remote from the chamber, the system comprising:
-
a blood pump having an inlet and an outlet, the outlet being adapted for connection to the first location in the circulatory system of the patient; a cannula having an inner wall defining a lumen, a proximal end portion configured to couple to the inlet of the blood pump, and a distal end portion configured for insertion into the chamber of the heart; and an insertion device for assisting with insertion of the distal end of the cannula into the chamber of the heart, including a shaft including a distal end, the shaft configured to be received within the lumen of the cannula; a tip member coupled to the distal end of the shaft, the tip member configured to extend distally out from the lumen of the cannula so as to be in position for dilating a puncture in the tissue; and a compressible member operatively coupled to the shaft and configured to expand in a generally radially outward direction when compressed in an axial direction; wherein the compressible member is movable from an initial state in which the compressible member has a first radial dimension to a compressed state in which the compressible member has a second radial dimension that is larger than the first radial dimension, the second radial dimension configured to engage the inner wall of the lumen of the cannula to releasably secure the insertion device to the cannula.
-
Specification